<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>

        .box{
            width: 500px;
            height: 500px;
            border: 5px solid rebeccapurple;
            /* 构建3d舞台
                flat 2d
                preserve-3d 3D
            
            */
            transform-style: preserve-3d;
            margin: 0 auto;

            /* transform: rotateY(30deg); */

            /* 设置景深 */
            perspective: 900px;
        }

        .content{
            position: absolute;
            width: 200px;
            height: 200px;
            background: red;
            left: 50%;
            top: 50%;
            margin-left: -100px;
            margin-top: -100px;
            /* transform: translateZ(100px) */
            transition: all 5s;
        }
        .box:hover .content{
            transform: translate3d(0,0,200px);
        }

    </style>
</head>
<body>


    <div class="box">

            <div class="content"></div>
    </div>
    

</body>
</html>